Some addons work on the fly by just putting them in the addons folder, some don't.
So, as we already reported from the Press Event Rock-rksl wrote a preview from some Armed Assault addons will be able to be used in Arma 2 without problems where others will need to be reworked (a bit or a lot nobody knows) :)

Quote :Hello, I made a short video showing the Civilian/Civilian vehicle modules in action. As a mission maker I was interested in what these modules had to offer and was very impressed with them because they were dynamic and a city never seems to populate in the same way twice. It really gave a sense of depth in the environment to watch people casually go about their day, and then ruin it for them